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libosmo-sccp/src/osmo_ss7.c

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/* Core SS7 Instance/Linkset/Link/AS/ASP Handling */
/* (C) 2015-2017 by Harald Welte <laforge@gnumonks.org>
* All Rights Reserved
*
* SPDX-License-Identifier: GPL-2.0+
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <inttypes.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/sctp.h>
#include <osmocom/sigtran/osmo_ss7.h>
#include <osmocom/sigtran/mtp_sap.h>
#include <osmocom/sigtran/protocol/mtp.h>
#include <osmocom/sigtran/protocol/sua.h>
#include <osmocom/sigtran/protocol/m3ua.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/select.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/socket.h>
#include <osmocom/core/sockaddr_str.h>
#include <osmocom/netif/stream.h>
#include <osmocom/netif/ipa.h>
#include <osmocom/netif/sctp.h>
#include "sccp_internal.h"
#include "xua_internal.h"
#include "ss7_internal.h"
#include "xua_asp_fsm.h"
#include "xua_as_fsm.h"
#define MAX_PC_STR_LEN 32
static bool ss7_initialized = false;
LLIST_HEAD(osmo_ss7_instances);
static int32_t next_rctx = 1;
static int32_t next_l_rk_id = 1;
const struct value_string mtp_unavail_cause_vals[] = {
{ MTP_UNAVAIL_C_UNKNOWN, "unknown" },
{ MTP_UNAVAIL_C_UNEQUIP_REM_USER, "unequipped-remote-user" },
{ MTP_UNAVAIL_C_INACC_REM_USER, "inaccessible-remote-user" },
{ 0, NULL }
};
struct value_string osmo_ss7_as_traffic_mode_vals[] = {
{ OSMO_SS7_AS_TMOD_BCAST, "broadcast" },
{ OSMO_SS7_AS_TMOD_LOADSHARE, "loadshare" },
{ OSMO_SS7_AS_TMOD_ROUNDROBIN, "round-robin" },
{ OSMO_SS7_AS_TMOD_OVERRIDE, "override" },
{ 0, NULL }
};
struct value_string osmo_ss7_asp_protocol_vals[] = {
{ OSMO_SS7_ASP_PROT_NONE, "none" },
{ OSMO_SS7_ASP_PROT_SUA, "sua" },
{ OSMO_SS7_ASP_PROT_M3UA, "m3ua" },
{ OSMO_SS7_ASP_PROT_IPA, "ipa" },
{ 0, NULL }
};
const struct value_string osmo_ss7_asp_role_names[] = {
{ OSMO_SS7_ASP_ROLE_ASP, "ASP" },
{ OSMO_SS7_ASP_ROLE_SG, "SG" },
{ OSMO_SS7_ASP_ROLE_IPSP, "IPSP" },
{ 0, NULL }
};
static int asp_proto_to_ip_proto(enum osmo_ss7_asp_protocol proto)
{
switch (proto) {
case OSMO_SS7_ASP_PROT_IPA:
return IPPROTO_TCP;
case OSMO_SS7_ASP_PROT_SUA:
case OSMO_SS7_ASP_PROT_M3UA:
default:
return IPPROTO_SCTP;
}
}
int osmo_ss7_find_free_rctx(struct osmo_ss7_instance *inst)
{
int32_t rctx;
for (rctx = next_rctx; rctx; rctx = ++next_rctx) {
if (!osmo_ss7_as_find_by_rctx(inst, next_rctx))
return rctx;
}
return -1;
}
static uint32_t find_free_l_rk_id(struct osmo_ss7_instance *inst)
{
uint32_t l_rk_id;
for (l_rk_id = next_l_rk_id; next_l_rk_id; l_rk_id = ++next_l_rk_id) {
if (!osmo_ss7_as_find_by_l_rk_id(inst, next_l_rk_id))
return l_rk_id;
}
return -1;
}
/***********************************************************************
* SS7 Point Code Parsing / Printing
***********************************************************************/
static const struct osmo_ss7_pc_fmt default_pc_fmt = {
.delimiter = '.',
.component_len = { 3, 8, 3},
};
/* like strcat() but appends a single character */
static int strnappendchar(char *str, char c, size_t n)
{
unsigned int curlen = strlen(str);
if (n < curlen + 2)
return -1;
str[curlen] = c;
str[curlen+1] = '\0';
return curlen+1;
}
/* generate a format string for formatting a point code. The result can
* e.g. be used with sscanf() or sprintf() */
static const char *gen_pc_fmtstr(const struct osmo_ss7_pc_fmt *pc_fmt,
unsigned int *num_comp_exp)
{
static char buf[MAX_PC_STR_LEN];
unsigned int num_comp = 0;
buf[0] = '\0';
strcat(buf, "%u");
num_comp++;
if (pc_fmt->component_len[1] == 0)
goto out;
strnappendchar(buf, pc_fmt->delimiter, sizeof(buf));
strcat(buf, "%u");
num_comp++;
if (pc_fmt->component_len[2] == 0)
goto out;
strnappendchar(buf, pc_fmt->delimiter, sizeof(buf));
strcat(buf, "%u");
num_comp++;
out:
if (num_comp_exp)
*num_comp_exp = num_comp;
return buf;
}
/* get number of components we expect for a point code, depending on the
* configuration of this ss7_instance */
static unsigned int num_pc_comp_exp(const struct osmo_ss7_pc_fmt *pc_fmt)
{
unsigned int num_comp_exp = 1;
if (pc_fmt->component_len[1])
num_comp_exp++;
if (pc_fmt->component_len[2])
num_comp_exp++;
return num_comp_exp;
}
/* get the total width (in bits) of the point-codes in this ss7_instance */
uint8_t osmo_ss7_pc_width(const struct osmo_ss7_pc_fmt *pc_fmt)
{
return pc_fmt->component_len[0] + pc_fmt->component_len[1] + pc_fmt->component_len[2];
}
/* truncate pc or mask to maximum permitted length. This solves
* callers specifying arbitrary large masks which then evade duplicate
* detection with longer mask lengths */
uint32_t osmo_ss7_pc_normalize(const struct osmo_ss7_pc_fmt *pc_fmt, uint32_t pc)
{
uint32_t mask = (1 << osmo_ss7_pc_width(pc_fmt))-1;
return pc & mask;
}
/* get the number of bits we must shift the given component of a point
* code in this ss7_instance */
static unsigned int get_pc_comp_shift(const struct osmo_ss7_pc_fmt *pc_fmt,
unsigned int comp_num)
{
uint32_t pc_width = osmo_ss7_pc_width(pc_fmt);
switch (comp_num) {
case 0:
return pc_width - pc_fmt->component_len[0];
case 1:
return pc_width - pc_fmt->component_len[0] - pc_fmt->component_len[1];
case 2:
return 0;
default:
/* Invalid number of components */
OSMO_ASSERT(false);
}
}
static uint32_t pc_comp_shift_and_mask(const struct osmo_ss7_pc_fmt *pc_fmt,
unsigned int comp_num, uint32_t pc)
{
unsigned int shift = get_pc_comp_shift(pc_fmt, comp_num);
uint32_t mask = (1 << pc_fmt->component_len[comp_num]) - 1;
return (pc >> shift) & mask;
}
/* parse a point code according to the structure configured for this
* ss7_instance */
int osmo_ss7_pointcode_parse(struct osmo_ss7_instance *inst, const char *str)
{
unsigned int component[3];
const struct osmo_ss7_pc_fmt *pc_fmt = inst ? &inst->cfg.pc_fmt : &default_pc_fmt;
unsigned int num_comp_exp = num_pc_comp_exp(pc_fmt);
const char *fmtstr = gen_pc_fmtstr(pc_fmt, &num_comp_exp);
int i, rc;
rc = sscanf(str, fmtstr, &component[0], &component[1], &component[2]);
/* ensure all components were parsed */
if (rc != num_comp_exp)
goto err;
/* check none of the component values exceeds what can be
* represented within its bit-width */
for (i = 0; i < num_comp_exp; i++) {
if (component[i] >= (1 << pc_fmt->component_len[i]))
goto err;
}
/* shift them all together */
rc = (component[0] << get_pc_comp_shift(pc_fmt, 0));
if (num_comp_exp > 1)
rc |= (component[1] << get_pc_comp_shift(pc_fmt, 1));
if (num_comp_exp > 2)
rc |= (component[2] << get_pc_comp_shift(pc_fmt, 2));
return rc;
err:
LOGSS7(inst, LOGL_NOTICE, "Error parsing Pointcode '%s'\n", str);
return -EINVAL;
}
const char *osmo_ss7_pointcode_print_buf(char *buf, size_t len, const struct osmo_ss7_instance *inst, uint32_t pc)
{
const struct osmo_ss7_pc_fmt *pc_fmt;
unsigned int num_comp_exp;
const char *fmtstr;
if (!osmo_ss7_pc_is_valid(pc))
return "(no PC)";
pc_fmt = inst ? &inst->cfg.pc_fmt : &default_pc_fmt;
num_comp_exp = num_pc_comp_exp(pc_fmt);
fmtstr = gen_pc_fmtstr(pc_fmt, &num_comp_exp);
OSMO_ASSERT(fmtstr);
snprintf(buf, len, fmtstr,
pc_comp_shift_and_mask(pc_fmt, 0, pc),
pc_comp_shift_and_mask(pc_fmt, 1, pc),
pc_comp_shift_and_mask(pc_fmt, 2, pc));
return buf;
}
/* print a pointcode according to the structure configured for this
* ss7_instance */
const char *osmo_ss7_pointcode_print(const struct osmo_ss7_instance *inst, uint32_t pc)
{
static char buf[MAX_PC_STR_LEN];
return osmo_ss7_pointcode_print_buf(buf, sizeof(buf), inst, pc);
}
/* same as osmo_ss7_pointcode_print() but using a separate buffer, useful for multiple point codes in the
* same LOGP/printf. */
const char *osmo_ss7_pointcode_print2(const struct osmo_ss7_instance *inst, uint32_t pc)
{
static char buf[MAX_PC_STR_LEN];
return osmo_ss7_pointcode_print_buf(buf, sizeof(buf), inst, pc);
}
int osmo_ss7_pointcode_parse_mask_or_len(struct osmo_ss7_instance *inst, const char *in)
{
unsigned int width = osmo_ss7_pc_width(inst ? &inst->cfg.pc_fmt : &default_pc_fmt);
if (in[0] == '/') {
/* parse mask by length */
int masklen = atoi(in+1);
if (masklen < 0 || masklen > 32)
return -EINVAL;
if (masklen == 0)
return 0;
return (0xFFFFFFFF << (width - masklen)) & ((1 << width)-1);
} else {
/* parse mask as point code */
return osmo_ss7_pointcode_parse(inst, in);
}
}
static const uint16_t prot2port[] = {
[OSMO_SS7_ASP_PROT_NONE] = 0,
[OSMO_SS7_ASP_PROT_SUA] = SUA_PORT,
[OSMO_SS7_ASP_PROT_M3UA] = M3UA_PORT,
[OSMO_SS7_ASP_PROT_IPA] = 5000,
};
int osmo_ss7_asp_protocol_port(enum osmo_ss7_asp_protocol prot)
{
if (prot >= ARRAY_SIZE(prot2port))
return -EINVAL;
else
return prot2port[prot];
}
/***********************************************************************
* SS7 Instance
***********************************************************************/
/*! \brief Find a SS7 Instance with given ID
* \param[in] id ID for which to search
* \returns \ref osmo_ss7_instance on success; NULL on error */
struct osmo_ss7_instance *
osmo_ss7_instance_find(uint32_t id)
{
OSMO_ASSERT(ss7_initialized);
struct osmo_ss7_instance *inst;
llist_for_each_entry(inst, &osmo_ss7_instances, list) {
if (inst->cfg.id == id)
return inst;
}
return NULL;
}
/*! \brief Find or create a SS7 Instance
* \param[in] ctx talloc allocation context to use for allocations
* \param[in] id ID of SS7 Instance
* \returns \ref osmo_ss7_instance on success; NULL on error */
struct osmo_ss7_instance *
osmo_ss7_instance_find_or_create(void *ctx, uint32_t id)
{
struct osmo_ss7_instance *inst;
OSMO_ASSERT(ss7_initialized);
inst = osmo_ss7_instance_find(id);
if (inst)
return inst;
inst = talloc_zero(ctx, struct osmo_ss7_instance);
if (!inst)
return NULL;
inst->cfg.primary_pc = OSMO_SS7_PC_INVALID;
inst->cfg.id = id;
LOGSS7(inst, LOGL_INFO, "Creating SS7 Instance\n");
INIT_LLIST_HEAD(&inst->linksets);
INIT_LLIST_HEAD(&inst->as_list);
INIT_LLIST_HEAD(&inst->asp_list);
INIT_LLIST_HEAD(&inst->rtable_list);
INIT_LLIST_HEAD(&inst->xua_servers);
inst->rtable_system = osmo_ss7_route_table_find_or_create(inst, "system");
/* default point code structure + formatting */
inst->cfg.pc_fmt.delimiter = '.';
inst->cfg.pc_fmt.component_len[0] = 3;
inst->cfg.pc_fmt.component_len[1] = 8;
inst->cfg.pc_fmt.component_len[2] = 3;
llist_add_tail(&inst->list, &osmo_ss7_instances);
INIT_LLIST_HEAD(&inst->cfg.sccp_address_book);
return inst;
}
/*! \brief Destroy a SS7 Instance
* \param[in] inst SS7 Instance to be destroyed */
void osmo_ss7_instance_destroy(struct osmo_ss7_instance *inst)
{
struct osmo_ss7_linkset *lset, *lset2;
struct osmo_ss7_as *as, *as2;
struct osmo_ss7_asp *asp, *asp2;
OSMO_ASSERT(ss7_initialized);
LOGSS7(inst, LOGL_INFO, "Destroying SS7 Instance\n");
llist_for_each_entry_safe(asp, asp2, &inst->asp_list, list)
osmo_ss7_asp_destroy(asp);
llist_for_each_entry_safe(as, as2, &inst->as_list, list)
osmo_ss7_as_destroy(as);
llist_for_each_entry_safe(lset, lset2, &inst->linksets, list)
osmo_ss7_linkset_destroy(lset);
llist_del(&inst->list);
talloc_free(inst);
}
/*! \brief Set the point code format used in given SS7 instance */
int osmo_ss7_instance_set_pc_fmt(struct osmo_ss7_instance *inst,
uint8_t c0, uint8_t c1, uint8_t c2)
{
if (c0+c1+c2 > 32)
return -EINVAL;
if (c0+c1+c2 > 14)
LOGSS7(inst, LOGL_NOTICE, "Point Code Format %u-%u-%u "
"is longer than 14 bits, odd?\n", c0, c1, c2);
inst->cfg.pc_fmt.component_len[0] = c0;
inst->cfg.pc_fmt.component_len[1] = c1;
inst->cfg.pc_fmt.component_len[2] = c2;
return 0;
}
/*! Allocate an SCCP instance, if not present yet.
* \returns inst->sccp. */
struct osmo_sccp_instance *osmo_ss7_ensure_sccp(struct osmo_ss7_instance *inst)
{
if (inst->sccp)
return inst->sccp;
LOGSS7(inst, LOGL_NOTICE, "Creating SCCP instance\n");
inst->sccp = osmo_sccp_instance_create(inst, NULL);
return inst->sccp;
}
/***********************************************************************
* MTP Users (Users of MTP, such as SCCP or ISUP)
***********************************************************************/
/*! \brief Register a MTP user for a given service indicator
* \param[in] inst SS7 instance for which we register the user
* \param[in] service_ind Service (ISUP, SCCP, ...)
* \param[in] user SS7 user (including primitive call-back)
* \returns 0 on success; negative on error */
int osmo_ss7_user_register(struct osmo_ss7_instance *inst, uint8_t service_ind,
struct osmo_ss7_user *user)
{
if (service_ind >= ARRAY_SIZE(inst->user))
return -EINVAL;
if (inst->user[service_ind])
return -EBUSY;
DEBUGP(DLSS7, "registering user=%s for SI %u with priv %p\n",
user->name, service_ind, user->priv);
user->inst = inst;
inst->user[service_ind] = user;
return 0;
}
/*! \brief Unregister a MTP user for a given service indicator
* \param[in] inst SS7 instance for which we register the user
* \param[in] service_ind Service (ISUP, SCCP, ...)
* \param[in] user (optional) SS7 user. If present, we will not
* unregister other users
* \returns 0 on success; negative on error */
int osmo_ss7_user_unregister(struct osmo_ss7_instance *inst, uint8_t service_ind,
struct osmo_ss7_user *user)
{
if (service_ind >= ARRAY_SIZE(inst->user))
return -EINVAL;
if (!inst->user[service_ind])
return -ENODEV;
if (user && (inst->user[service_ind] != user))
return -EINVAL;
if (user)
user->inst = NULL;
inst->user[service_ind] = NULL;
return 0;
}
/* deliver to a local MTP user */
int osmo_ss7_mtp_to_user(struct osmo_ss7_instance *inst, struct osmo_mtp_prim *omp)
{
uint32_t service_ind;
const struct osmo_ss7_user *osu;
if (omp->oph.sap != MTP_SAP_USER ||
omp->oph.primitive != OSMO_MTP_PRIM_TRANSFER ||
omp->oph.operation != PRIM_OP_INDICATION) {
LOGP(DLSS7, LOGL_ERROR, "Unsupported Primitive\n");
return -EINVAL;
}
service_ind = omp->u.transfer.sio & 0xF;
osu = inst->user[service_ind];
if (!osu) {
LOGP(DLSS7, LOGL_NOTICE, "No MTP-User for SI %u\n", service_ind);
return -ENODEV;
}
DEBUGP(DLSS7, "delivering MTP-TRANSFER.ind to user %s, priv=%p\n",
osu->name, osu->priv);
return osu->prim_cb(&omp->oph, (void *) osu->priv);
}
/***********************************************************************
* SS7 Linkset
***********************************************************************/
/*! \brief Destroy a SS7 Linkset
* \param[in] lset Linkset to be destroyed */
void osmo_ss7_linkset_destroy(struct osmo_ss7_linkset *lset)
{
struct osmo_ss7_route *rt, *rt2;
unsigned int i;
OSMO_ASSERT(ss7_initialized);
LOGSS7(lset->inst, LOGL_INFO, "Destroying Linkset %s\n",
lset->cfg.name);
/* find any routes pointing to this AS and remove them */
llist_for_each_entry_safe(rt, rt2, &lset->inst->rtable_system->routes, list) {
if (rt->dest.linkset == lset)
osmo_ss7_route_destroy(rt);
}
for (i = 0; i < ARRAY_SIZE(lset->links); i++) {
struct osmo_ss7_link *link = lset->links[i];
if (!link)
continue;
osmo_ss7_link_destroy(link);
}
llist_del(&lset->list);
talloc_free(lset);
}
/*! \brief Find SS7 Linkset by given name
* \param[in] inst SS7 Instance in which to look
* \param[in] name Name of SS7 Linkset
* \returns pointer to linkset on success; NULL on error */
struct osmo_ss7_linkset *
osmo_ss7_linkset_find_by_name(struct osmo_ss7_instance *inst, const char *name)
{
struct osmo_ss7_linkset *lset;
OSMO_ASSERT(ss7_initialized);
llist_for_each_entry(lset, &inst->linksets, list) {
if (!strcmp(name, lset->cfg.name))
return lset;
}
return NULL;
}
/*! \brief Find or allocate SS7 Linkset
* \param[in] inst SS7 Instance in which we operate
* \param[in] name Name of SS7 Linkset
* \param[in] pc Adjacent Pointcode
* \returns pointer to Linkset on success; NULL on error */
struct osmo_ss7_linkset *
osmo_ss7_linkset_find_or_create(struct osmo_ss7_instance *inst, const char *name, uint32_t pc)
{
struct osmo_ss7_linkset *lset;
OSMO_ASSERT(ss7_initialized);
lset = osmo_ss7_linkset_find_by_name(inst, name);
if (lset && lset->cfg.adjacent_pc != pc)
return NULL;
if (!lset) {
LOGSS7(inst, LOGL_INFO, "Creating Linkset %s\n", name);
lset = talloc_zero(inst, struct osmo_ss7_linkset);
lset->inst = inst;
lset->cfg.adjacent_pc = pc;
lset->cfg.name = talloc_strdup(lset, name);
llist_add_tail(&lset->list, &inst->linksets);
}
return lset;
}
/***********************************************************************
* SS7 Link
***********************************************************************/
/*! \brief Destroy SS7 Link
* \param[in] link SS7 Link to be destroyed */
void osmo_ss7_link_destroy(struct osmo_ss7_link *link)
{
struct osmo_ss7_linkset *lset = link->linkset;
OSMO_ASSERT(ss7_initialized);
LOGSS7(lset->inst, LOGL_INFO, "Destroying Link %s:%u\n",
lset->cfg.name, link->cfg.id);
/* FIXME: do cleanup */
lset->links[link->cfg.id] = NULL;
talloc_free(link);
}
/*! \brief Find or create SS7 Link with given ID in given Linkset
* \param[in] lset SS7 Linkset on which we operate
* \param[in] id Link number within Linkset
* \returns pointer to SS7 Link on success; NULL on error */
struct osmo_ss7_link *
osmo_ss7_link_find_or_create(struct osmo_ss7_linkset *lset, uint32_t id)
{
struct osmo_ss7_link *link;
OSMO_ASSERT(ss7_initialized);
if (id >= ARRAY_SIZE(lset->links))
return NULL;
if (lset->links[id]) {
link = lset->links[id];
} else {
LOGSS7(lset->inst, LOGL_INFO, "Creating Link %s:%u\n",
lset->cfg.name, id);
link = talloc_zero(lset, struct osmo_ss7_link);
if (!link)
return NULL;
link->linkset = lset;
lset->links[id] = link;
link->cfg.id = id;
}
return link;
}
/***********************************************************************
* SS7 Route Tables
***********************************************************************/
struct osmo_ss7_route_table *
osmo_ss7_route_table_find(struct osmo_ss7_instance *inst, const char *name)
{
struct osmo_ss7_route_table *rtbl;
OSMO_ASSERT(ss7_initialized);
llist_for_each_entry(rtbl, &inst->rtable_list, list) {
if (!strcmp(rtbl->cfg.name, name))
return rtbl;
}
return NULL;
}
struct osmo_ss7_route_table *
osmo_ss7_route_table_find_or_create(struct osmo_ss7_instance *inst, const char *name)
{
struct osmo_ss7_route_table *rtbl;
OSMO_ASSERT(ss7_initialized);
rtbl = osmo_ss7_route_table_find(inst, name);
if (!rtbl) {
LOGSS7(inst, LOGL_INFO, "Creating Route Table %s\n", name);
rtbl = talloc_zero(inst, struct osmo_ss7_route_table);
rtbl->inst = inst;
rtbl->cfg.name = talloc_strdup(rtbl, name);
INIT_LLIST_HEAD(&rtbl->routes);
llist_add_tail(&rtbl->list, &inst->rtable_list);
}
return rtbl;
}
void osmo_ss7_route_table_destroy(struct osmo_ss7_route_table *rtbl)
{
llist_del(&rtbl->list);
/* routes are allocated as children of route table, will be
* automatically freed() */
talloc_free(rtbl);
}
/***********************************************************************
* SS7 Routes
***********************************************************************/
/*! \brief Find a SS7 route for given destination point code in given table */
struct osmo_ss7_route *
osmo_ss7_route_find_dpc(struct osmo_ss7_route_table *rtbl, uint32_t dpc)
{
struct osmo_ss7_route *rt;
OSMO_ASSERT(ss7_initialized);
dpc = osmo_ss7_pc_normalize(&rtbl->inst->cfg.pc_fmt, dpc);
/* we assume the routes are sorted by mask length, i.e. more
* specific routes first, and less specific routes with shorter
* mask later */
llist_for_each_entry(rt, &rtbl->routes, list) {
if ((dpc & rt->cfg.mask) == rt->cfg.pc)
return rt;
}
return NULL;
}
/*! \brief Find a SS7 route for given destination point code + mask in given table */
struct osmo_ss7_route *
osmo_ss7_route_find_dpc_mask(struct osmo_ss7_route_table *rtbl, uint32_t dpc,
uint32_t mask)
{
struct osmo_ss7_route *rt;
OSMO_ASSERT(ss7_initialized);
mask = osmo_ss7_pc_normalize(&rtbl->inst->cfg.pc_fmt, mask);
dpc = osmo_ss7_pc_normalize(&rtbl->inst->cfg.pc_fmt, dpc);
/* we assume the routes are sorted by mask length, i.e. more
* specific routes first, and less specific routes with shorter
* mask later */
llist_for_each_entry(rt, &rtbl->routes, list) {
if (dpc == rt->cfg.pc && mask == rt->cfg.mask)
return rt;
}
return NULL;
}
/*! \brief Find a SS7 route for given destination point code in given SS7 */
struct osmo_ss7_route *
osmo_ss7_route_lookup(struct osmo_ss7_instance *inst, uint32_t dpc)
{
OSMO_ASSERT(ss7_initialized);
return osmo_ss7_route_find_dpc(inst->rtable_system, dpc);
}
/* insert the route in the ordered list of routes. The list is sorted by
* mask length, so that the more specific (longer mask) routes are
* first, while the less specific routes with shorter masks are last.
* Hence, the first matching route in a linear iteration is the most
* specific match. */
static void route_insert_sorted(struct osmo_ss7_route_table *rtbl,
struct osmo_ss7_route *cmp)
{
struct osmo_ss7_route *rt;
llist_for_each_entry(rt, &rtbl->routes, list) {
if (rt->cfg.mask < cmp->cfg.mask) {
/* insert before the current entry */
llist_add(&cmp->list, rt->list.prev);
return;
}
}
/* not added, i.e. no smaller mask length found: we are the
* smallest mask and thus should go last */
llist_add_tail(&cmp->list, &rtbl->routes);
}
/*! \brief Create a new route in the given routing table
* \param[in] rtbl Routing Table in which the route is to be created
* \param[in] pc Point Code of the destination of the route
* \param[in] mask Mask of the destination Point Code \ref pc
* \param[in] linkset_name string name of the linkset to be used
* \returns caller-allocated + initialized route, NULL on error
*/
struct osmo_ss7_route *
osmo_ss7_route_create(struct osmo_ss7_route_table *rtbl, uint32_t pc,
uint32_t mask, const char *linkset_name)
{
struct osmo_ss7_route *rt;
struct osmo_ss7_linkset *lset;
struct osmo_ss7_as *as = NULL;
/* truncate mask to maximum. Let's avoid callers specifying arbitrary large
* masks to ensure we don't fail duplicate detection with longer mask lengths */
mask = osmo_ss7_pc_normalize(&rtbl->inst->cfg.pc_fmt, mask);
pc = osmo_ss7_pc_normalize(&rtbl->inst->cfg.pc_fmt, pc);
OSMO_ASSERT(ss7_initialized);
lset = osmo_ss7_linkset_find_by_name(rtbl->inst, linkset_name);
if (!lset) {
as = osmo_ss7_as_find_by_name(rtbl->inst, linkset_name);
if (!as)
return NULL;
}
/* check for duplicates */
rt = osmo_ss7_route_find_dpc_mask(rtbl, pc, mask);
if (rt && !strcmp(rt->cfg.linkset_name, linkset_name)) {
LOGSS7(rtbl->inst, LOGL_ERROR, "Refusing to create duplicate route: "
"pc=%u=%s mask=0x%x via linkset/AS '%s'\n",
pc, osmo_ss7_pointcode_print(rtbl->inst, pc), mask, linkset_name);
return rt;
}
rt = talloc_zero(rtbl, struct osmo_ss7_route);
if (!rt)
return NULL;
rt->cfg.pc = pc;
rt->cfg.mask = mask;
rt->cfg.linkset_name = talloc_strdup(rt, linkset_name);
if (lset) {
rt->dest.linkset = lset;
LOGSS7(rtbl->inst, LOGL_INFO, "Creating route: pc=%u=%s mask=0x%x via linkset '%s'\n",
pc, osmo_ss7_pointcode_print(rtbl->inst, pc), mask, lset->cfg.name);
} else {
rt->dest.as = as;
LOGSS7(rtbl->inst, LOGL_INFO, "Creating route: pc=%u=%s mask=0x%x via AS '%s'\n",
pc, osmo_ss7_pointcode_print(rtbl->inst, pc), mask, as->cfg.name);
}
rt->rtable = rtbl;
route_insert_sorted(rtbl, rt);
return rt;
}
/*! \brief Destroy a given SS7 route */
void osmo_ss7_route_destroy(struct osmo_ss7_route *rt)
{
struct osmo_ss7_route_table *rtbl = rt->rtable;
OSMO_ASSERT(ss7_initialized);
LOGSS7(rtbl->inst, LOGL_INFO, "Destroying route: pc=%u=%s mask=0x%x via linkset/ASP '%s'\n",
rt->cfg.pc, osmo_ss7_pointcode_print(rtbl->inst, rt->cfg.pc), rt->cfg.mask, rt->cfg.linkset_name);
llist_del(&rt->list);
talloc_free(rt);
}
/* count number of consecutive leading (MSB) bits that are '1' */
static unsigned int count_leading_one_bits(uint32_t inp, unsigned int nbits)
{
unsigned int i;
for (i = 0; i < nbits; i++) {
if (!(inp & (1 << (nbits-1-i))))
return i;
}
return i;
}
/* determine the mask length in number of bits; negative if non-consecutive mask */
static int u32_masklen(uint32_t mask, unsigned int nbits)
{
unsigned int i;
unsigned int leading_one_bits = count_leading_one_bits(mask, nbits);
/* are there any bits set after the initial bits? */
for (i = leading_one_bits; i < nbits; i++) {
if (mask & (1 << (nbits-1-i)))
return -1; /* not a simple prefix mask */
}
return leading_one_bits;
}
const char *osmo_ss7_route_print(const struct osmo_ss7_route *rt)
{
const struct osmo_ss7_instance *inst = rt->rtable->inst;
unsigned int pc_width = osmo_ss7_pc_width(&inst->cfg.pc_fmt);
static char buf[64];
int rc = u32_masklen(rt->cfg.mask, pc_width);
if (rc < 0)
snprintf(buf, sizeof(buf), "%s/%s", osmo_ss7_pointcode_print(inst, rt->cfg.pc),
osmo_ss7_pointcode_print2(inst, rt->cfg.mask));
else
snprintf(buf, sizeof(buf), "%s/%u", osmo_ss7_pointcode_print(inst, rt->cfg.pc), rc);
return buf;
}
/***********************************************************************
* SS7 Application Server
***********************************************************************/
static const struct rate_ctr_desc ss7_as_rcd[] = {
[SS7_AS_CTR_RX_MSU_TOTAL] = { "rx:msu:total", "Total number of MSU received" },
[SS7_AS_CTR_TX_MSU_TOTAL] = { "tx:msu:total", "Total number of MSU transmitted" },
};
static const struct rate_ctr_group_desc ss7_as_rcgd = {
.group_name_prefix = "sigtran_as",
.group_description = "SIGTRAN Application Server",
.num_ctr = ARRAY_SIZE(ss7_as_rcd),
.ctr_desc = ss7_as_rcd,
};
static unsigned int g_ss7_as_rcg_idx;
/*! \brief Find Application Server by given name
* \param[in] inst SS7 Instance on which we operate
* \param[in] name Name of AS
* \returns pointer to Application Server on success; NULL otherwise */
struct osmo_ss7_as *
osmo_ss7_as_find_by_name(struct osmo_ss7_instance *inst, const char *name)
{
struct osmo_ss7_as *as;
OSMO_ASSERT(ss7_initialized);
llist_for_each_entry(as, &inst->as_list, list) {
if (!strcmp(name, as->cfg.name))
return as;
}
return NULL;
}
/*! \brief Find Application Server by given routing context
* \param[in] inst SS7 Instance on which we operate
* \param[in] rctx Routing Context
* \returns pointer to Application Server on success; NULL otherwise */
struct osmo_ss7_as *
osmo_ss7_as_find_by_rctx(struct osmo_ss7_instance *inst, uint32_t rctx)
{
struct osmo_ss7_as *as;
OSMO_ASSERT(ss7_initialized);
llist_for_each_entry(as, &inst->as_list, list) {
if (as->cfg.routing_key.context == rctx)
return as;
}
return NULL;
}
/*! \brief Find Application Server by given local routing key ID
* \param[in] inst SS7 Instance on which we operate
* \param[in] l_rk_id Local Routing Key ID
* \returns pointer to Application Server on success; NULL otherwise */
struct osmo_ss7_as *
osmo_ss7_as_find_by_l_rk_id(struct osmo_ss7_instance *inst, uint32_t l_rk_id)
{
struct osmo_ss7_as *as;
OSMO_ASSERT(ss7_initialized);
llist_for_each_entry(as, &inst->as_list, list) {
if (as->cfg.routing_key.l_rk_id == l_rk_id)
return as;
}
return NULL;
}
/*! \brief Find Application Server (AS) by given protocol.
* \param[in] inst SS7 Instance on which we operate
* \param[in] proto Protocol identifier that must match
* \returns pointer to AS on success; NULL otherwise
* If an AS has an ASP also matching the given protocol, that AS is preferred.
* If there are multiple matches, return the first matching AS. */
struct osmo_ss7_as *osmo_ss7_as_find_by_proto(struct osmo_ss7_instance *inst,
enum osmo_ss7_asp_protocol proto)
{
struct osmo_ss7_as *as;
struct osmo_ss7_as *as_without_asp = NULL;
OSMO_ASSERT(ss7_initialized);
/* Loop through the list with AS and try to find one where the proto
matches up */
llist_for_each_entry(as, &inst->as_list, list) {
if (as->cfg.proto == proto) {
/* Put down the first AS that matches the proto, just in
* case we will not find any matching ASP */
if (!as_without_asp)
as_without_asp = as;
/* Check if the candicate we have here has any suitable
* ASP */
if (osmo_ss7_asp_find_by_proto(as, proto))
return as;
}
}
/* Return with the second best find, if there is any */
return as_without_asp;
}
/*! \brief Find or Create Application Server
* \param[in] inst SS7 Instance on which we operate
* \param[in] name Name of Application Server
* \param[in] proto Protocol of Application Server
* \returns pointer to Application Server on success; NULL otherwise */
struct osmo_ss7_as *
osmo_ss7_as_find_or_create(struct osmo_ss7_instance *inst, const char *name,
enum osmo_ss7_asp_protocol proto)
{
struct osmo_ss7_as *as;
OSMO_ASSERT(ss7_initialized);
as = osmo_ss7_as_find_by_name(inst, name);
if (as && as->cfg.proto != proto)
return NULL;
if (!as) {
as = talloc_zero(inst, struct osmo_ss7_as);
if (!as)
return NULL;
as->ctrg = rate_ctr_group_alloc(as, &ss7_as_rcgd, g_ss7_as_rcg_idx++);
if (!as->ctrg) {
talloc_free(as);
return NULL;
}
rate_ctr_group_set_name(as->ctrg, name);
as->inst = inst;
as->cfg.name = talloc_strdup(as, name);
as->cfg.proto = proto;
as->cfg.mode = OSMO_SS7_AS_TMOD_OVERRIDE;
as->cfg.recovery_timeout_msec = 2000;
as->cfg.routing_key.l_rk_id = find_free_l_rk_id(inst);
as->fi = xua_as_fsm_start(as, LOGL_DEBUG);
llist_add_tail(&as->list, &inst->as_list);
LOGPAS(as, DLSS7, LOGL_INFO, "Created AS\n");
}
return as;
}
/*! \brief Add given ASP to given AS
* \param[in] as Application Server to which \ref asp is added
* \param[in] asp Application Server Process to be added to \ref as
* \returns 0 on success; negative in case of error */
int osmo_ss7_as_add_asp(struct osmo_ss7_as *as, const char *asp_name)
{
struct osmo_ss7_asp *asp;
unsigned int i;
OSMO_ASSERT(ss7_initialized);
asp = osmo_ss7_asp_find_by_name(as->inst, asp_name);
if (!asp)
return -ENODEV;
LOGPAS(as, DLSS7, LOGL_INFO, "Adding ASP %s to AS\n", asp->cfg.name);
if (osmo_ss7_as_has_asp(as, asp))
return 0;
for (i = 0; i < ARRAY_SIZE(as->cfg.asps); i++) {
if (!as->cfg.asps[i]) {
as->cfg.asps[i] = asp;
return 0;
}
}
return -ENOSPC;
}
/*! \brief Delete given ASP from given AS
* \param[in] as Application Server from which \ref asp is deleted
* \param[in] asp Application Server Process to delete from \ref as
* \returns 0 on success; negative in case of error */
int osmo_ss7_as_del_asp(struct osmo_ss7_as *as, const char *asp_name)
{
struct osmo_ss7_asp *asp;
unsigned int i;
OSMO_ASSERT(ss7_initialized);
asp = osmo_ss7_asp_find_by_name(as->inst, asp_name);
if (!asp)
return -ENODEV;
LOGPAS(as, DLSS7, LOGL_INFO, "Removing ASP %s from AS\n", asp->cfg.name);
for (i = 0; i < ARRAY_SIZE(as->cfg.asps); i++) {
if (as->cfg.asps[i] == asp) {
as->cfg.asps[i] = NULL;
return 0;
}
}
return -EINVAL;
}
/*! \brief Destroy given Application Server
* \param[in] as Application Server to destroy */
void osmo_ss7_as_destroy(struct osmo_ss7_as *as)
{
struct osmo_ss7_route *rt, *rt2;
OSMO_ASSERT(ss7_initialized);
LOGPAS(as, DLSS7, LOGL_INFO, "Destroying AS\n");
if (as->fi)
osmo_fsm_inst_term(as->fi, OSMO_FSM_TERM_REQUEST, NULL);
/* find any routes pointing to this AS and remove them */
llist_for_each_entry_safe(rt, rt2, &as->inst->rtable_system->routes, list) {
if (rt->dest.as == as)
osmo_ss7_route_destroy(rt);
}
as->inst = NULL;
llist_del(&as->list);
rate_ctr_group_free(as->ctrg);
talloc_free(as);
}
/*! \brief Determine if given AS contains ASP
* \param[in] as Application Server in which to look for \ref asp
* \param[in] asp Application Server Process to look for in \ref as
* \returns true in case \ref asp is part of \ref as; false otherwise */
bool osmo_ss7_as_has_asp(const struct osmo_ss7_as *as,
const struct osmo_ss7_asp *asp)
{
unsigned int i;
OSMO_ASSERT(ss7_initialized);
for (i = 0; i < ARRAY_SIZE(as->cfg.asps); i++) {
if (as->cfg.asps[i] == asp)
return true;
}
return false;
}
/*! Determine if given AS is in the active state.
* \param[in] as Application Server.
* \returns true in case as is active; false otherwise. */
bool osmo_ss7_as_active(const struct osmo_ss7_as *as)
{
if (!as->fi)
return false;
return as->fi->state == XUA_AS_S_ACTIVE;
}
/***********************************************************************
* SS7 Application Server Process
***********************************************************************/
enum ss7_asp_ctr {
SS7_ASP_CTR_PKT_RX_TOTAL,
SS7_ASP_CTR_PKT_RX_UNKNOWN,
SS7_ASP_CTR_PKT_TX_TOTAL,
};
static const struct rate_ctr_desc ss7_asp_rcd[] = {
[SS7_ASP_CTR_PKT_RX_TOTAL] = { "rx:packets:total", "Total number of packets received" },
[SS7_ASP_CTR_PKT_RX_UNKNOWN] = { "rx:packets:unknown", "Number of packets received for unknown PPID" },
[SS7_ASP_CTR_PKT_TX_TOTAL] = { "tx:packets:total", "Total number of packets transmitted" },
};
static const struct rate_ctr_group_desc ss7_asp_rcgd = {
.group_name_prefix = "sigtran_asp",
.group_description = "SIGTRAN Application Server Process",
.num_ctr = ARRAY_SIZE(ss7_asp_rcd),
.ctr_desc = ss7_asp_rcd,
};
static unsigned int g_ss7_asp_rcg_idx;
int osmo_ss7_asp_peer_snprintf(char* buf, size_t buf_len, struct osmo_ss7_asp_peer *peer)
{
int len = 0, offset = 0, rem = buf_len;
int ret, i;
char *after;
if (buf_len < 3)
return -EINVAL;
if (peer->host_cnt > 1) {
ret = snprintf(buf, rem, "(");
if (ret < 0)
return ret;
OSMO_SNPRINTF_RET(ret, rem, offset, len);
}
for (i = 0; i < peer->host_cnt; i++) {
if (peer->host_cnt == 1)
after = "";
else
after = (i == (peer->host_cnt - 1)) ? ")" : "|";
ret = snprintf(buf + offset, rem, "%s%s", peer->host[i] ? : "0.0.0.0", after);
OSMO_SNPRINTF_RET(ret, rem, offset, len);
}
ret = snprintf(buf + offset, rem, ":%u", peer->port);
if (ret < 0)
return ret;
OSMO_SNPRINTF_RET(ret, rem, offset, len);
return len;
}
/*! \brief Set (copy) addresses for a given ASP peer. Previous addresses are freed.
* \param[in] peer Application Server Process peer whose addresses are to be set.
* \param[in] talloc_ctx talloc context used to allocate new addresses.
* \param[in] hosts Array of strings containing IP addresses.
* \param[in] host_cnt Number of strings in hosts
* \returns 0 on success; negative otherwise */
int osmo_ss7_asp_peer_set_hosts(struct osmo_ss7_asp_peer *peer, void *talloc_ctx, const char* const* hosts, size_t host_cnt)
{
int i = 0;
if (host_cnt > ARRAY_SIZE(peer->host))
return -EINVAL;
for (; i < host_cnt; i++)
osmo_talloc_replace_string(talloc_ctx, &peer->host[i], hosts[i]);
for (; i < peer->host_cnt; i++) {
talloc_free(peer->host[i]);
peer->host[i] = NULL;
}
peer->host_cnt = host_cnt;
return 0;
}
/* Is string formatted IPv4/v6 addr considered IN(6)ADDR_ANY? */
static inline bool host_is_ip_anyaddr(const char *host, bool is_v6)
{
/* NULL addr is resolved as 0.0.0.0 (IPv4) by getaddrinfo(), most
* probably for backward-compatibility reasons.
*/
return is_v6 ? (host && !strcmp(host, "::"))
: (!host || !strcmp(host, "0.0.0.0"));
}
/*! \brief Append (copy) address to a given ASP peer. Previous addresses are kept.
* \param[in] peer Application Server Process peer the address is appended to.
* \param[in] talloc_ctx talloc context used to allocate new address.
* \param[in] host string containing an IP addresses.
* \returns 0 on success; negative otherwise */
int osmo_ss7_asp_peer_add_host(struct osmo_ss7_asp_peer *peer, void *talloc_ctx, const char *host)
{
int i;
bool new_is_v6 = osmo_ip_str_type(host) == AF_INET6;
bool new_is_any = host_is_ip_anyaddr(host, new_is_v6);
bool iter_is_v6;
if (peer->host_cnt >= ARRAY_SIZE(peer->host))
return -EINVAL;
/* Makes no sense to have INET(6)_ANY many times, or INET(6)_ANY
together with specific addresses, be it of same or different
IP version:*/
if (new_is_any && peer->host_cnt != 0)
return -EINVAL;
if (!new_is_any) {
/* Makes no sense to add specific address to set if INET(6)_ANY
is already set, be it from same or different IP version: */
for (i = 0; i < peer->host_cnt; i++) {
iter_is_v6 = osmo_ip_str_type(peer->host[i]) == AF_INET6;
if (host_is_ip_anyaddr(peer->host[i], iter_is_v6))
return -EINVAL;
}
}
osmo_talloc_replace_string(talloc_ctx, &peer->host[peer->host_cnt], host);
peer->host_cnt++;
return 0;
}
static bool ipv6_sctp_supported(const char *host, bool bind)
{
int rc;
struct addrinfo hints;
struct addrinfo *result;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_NUMERICHOST;
hints.ai_protocol = 0; /* Any protocol */
if (bind) /* For wildcard IP address */
hints.ai_flags |= AI_PASSIVE;
/* man getaddrinfo: Either node or service, but not both, may be NULL. */
OSMO_ASSERT(host);
rc = getaddrinfo(host, NULL, &hints, &result);
if (rc != 0) {
LOGP(DLSS7, LOGL_NOTICE, "Default IPv6 address %s not supported: %s\n",
host, gai_strerror(rc));
return false;
} else {
freeaddrinfo(result);
return true;
}
}
/* Set default values for local and remote peer hosts if they are not yet set.
* \param[in] asp ASP for which to set default hosts.
* \returns true if values where changed, false otherwise.
*
* If the ASP is already started, osmo_ss7_asp_restart() must be called
* afterwards in order to apply the new settings.
* This API is internal, hence doesn't appear in osmo_ss7.h
*/
bool osmo_ss7_asp_set_default_peer_hosts(struct osmo_ss7_asp *asp)
{
bool changed = false;
/* If no local addr was set */
if (!asp->cfg.local.host_cnt) {
bool rem_has_v4 = false, rem_has_v6 = false;
int i;
for (i = 0; i < asp->cfg.remote.host_cnt; i++) {
if (osmo_ip_str_type(asp->cfg.remote.host[i]) == AF_INET6)
rem_has_v6 = true;
else
rem_has_v4 = true;
}
/* "::" Covers both IPv4 and IPv6, but if only IPv4
* address are set on the remote side, IPv4 on the local
* side must be set too */
if (ipv6_sctp_supported("::", true) && !(rem_has_v4 && !rem_has_v6))
osmo_ss7_asp_peer_add_host(&asp->cfg.local, asp, "::");
else
osmo_ss7_asp_peer_add_host(&asp->cfg.local, asp, "0.0.0.0");
changed = true;
}
/* If no remote addr was set */
if (!asp->cfg.remote.host_cnt) {
osmo_ss7_asp_peer_add_host(&asp->cfg.remote, asp, "127.0.0.1");
if (ipv6_sctp_supported("::1", false))
osmo_ss7_asp_peer_add_host(&asp->cfg.remote, asp, "::1");
changed = true;
}
return changed;
}
struct osmo_ss7_asp *
osmo_ss7_asp_find_by_name(struct osmo_ss7_instance *inst, const char *name)
{
struct osmo_ss7_asp *asp;
OSMO_ASSERT(ss7_initialized);
llist_for_each_entry(asp, &inst->asp_list, list) {
if (!strcmp(name, asp->cfg.name))
return asp;
}
return NULL;
}
static uint16_t get_in_port(struct sockaddr *sa)
{
switch (sa->sa_family) {
case AF_INET:
return (((struct sockaddr_in*)sa)->sin_port);
case AF_INET6:
return (((struct sockaddr_in6*)sa)->sin6_port);
default:
return 0;
}
}
/* Converts string representation of v4-mappend-on-v6 IP addr to a pure IPv4 address.
* Example: ::ffff:172.18.19.200 => 172.18.19.200
*/
static void chop_v4_mapped_on_v6_prefix(char* buf)
{
char *last_colon;
size_t len;
char *first_dot = strchr(buf, '.');
if (!first_dot)
return; /* Not an IPv4-mappend-on-v6 string representation, nothing to do */
last_colon = strrchr(buf, ':');
if (!last_colon)
return; /* pure IPv4 address, nothing to do */
len = strlen(last_colon + 1);
memmove(buf, last_colon + 1, len);
buf[len] = '\0';
}
/*! \brief Find an ASP definition matching the local+remote IP/PORT of given fd
* \param[in] fd socket descriptor of given socket
* \returns SS7 ASP in case a matching one is found; NULL otherwise */
static struct osmo_ss7_asp *
osmo_ss7_asp_find_by_socket_addr(int fd)
{
struct osmo_ss7_instance *inst;
struct sockaddr_storage sa_l, sa_r;
socklen_t sa_len_l = sizeof(sa_l);
socklen_t sa_len_r = sizeof(sa_r);
char hostbuf_l[64], hostbuf_r[64];
uint16_t local_port, remote_port;
bool loc_is_v6, rem_is_v6;
int rc;
int i;
OSMO_ASSERT(ss7_initialized);
/* convert local and remote IP to string */
rc = getsockname(fd, (struct sockaddr*)&sa_l, &sa_len_l);
if (rc < 0)
return NULL;
rc = getnameinfo((struct sockaddr*)&sa_l, sa_len_l,
hostbuf_l, sizeof(hostbuf_l),
NULL, 0, NI_NUMERICHOST);
if (rc < 0)
return NULL;
local_port = ntohs(get_in_port((struct sockaddr*)&sa_l));
rc = getpeername(fd, (struct sockaddr*)&sa_r, &sa_len_r);
if (rc < 0)
return NULL;
rc = getnameinfo((struct sockaddr*)&sa_r, sa_len_r,
hostbuf_r, sizeof(hostbuf_r),
NULL, 0, NI_NUMERICHOST);
if (rc < 0)
return NULL;
remote_port = ntohs(get_in_port((struct sockaddr*)&sa_r));
/* If multi-home is used with both IPv4 and IPv6, then the socket is
* AF_INET6, and then returned IPv4 addresses are actually v6mapped ones.
* We need to convert them to IPv4 before matching.
*/
chop_v4_mapped_on_v6_prefix(hostbuf_l);
chop_v4_mapped_on_v6_prefix(hostbuf_r);
loc_is_v6 = osmo_ip_str_type(hostbuf_l) == AF_INET6;
rem_is_v6 = osmo_ip_str_type(hostbuf_r) == AF_INET6;
/* check all instances for any ASP definition matching the
* address combination of local/remote ip/port */
llist_for_each_entry(inst, &osmo_ss7_instances, list) {
struct osmo_ss7_asp *asp;
llist_for_each_entry(asp, &inst->asp_list, list) {
if (asp->cfg.local.port != local_port)
continue;
if (asp->cfg.remote.port && asp->cfg.remote.port != remote_port)
continue;
for (i = 0; i < asp->cfg.local.host_cnt; i++) {
bool iter_is_v6 = osmo_ip_str_type(asp->cfg.local.host[i]) == AF_INET6;
bool iter_is_anyaddr = host_is_ip_anyaddr(asp->cfg.local.host[i], iter_is_v6);
/* "::" (v6) covers "0.0.0.0" (v4), but not otherwise */
if (iter_is_v6 != loc_is_v6 &&
!(iter_is_v6 && iter_is_anyaddr))
continue;
if (iter_is_anyaddr ||
!strcmp(asp->cfg.local.host[i], hostbuf_l))
break;
}
if (i == asp->cfg.local.host_cnt)
continue; /* didn't match any local.host */
/* If no remote host was set, it's probably a server and hence we match any cli src */
if (asp->cfg.remote.host_cnt) {
for (i = 0; i < asp->cfg.remote.host_cnt; i++) {
bool iter_is_v6 = osmo_ip_str_type(asp->cfg.remote.host[i]) == AF_INET6;
bool iter_is_anyaddr = host_is_ip_anyaddr(asp->cfg.remote.host[i], iter_is_v6);
/* "::" (v6) covers "0.0.0.0" (v4), but not otherwise */
if (iter_is_v6 != rem_is_v6 &&
!(iter_is_v6 && iter_is_anyaddr))
continue;
if (iter_is_anyaddr ||
!strcmp(asp->cfg.remote.host[i], hostbuf_r))
break;
}
if (i == asp->cfg.remote.host_cnt)
continue; /* didn't match any remote.host */
}
return asp;
}
}
return NULL;
}
/*! \brief Find an ASP that matches the given protocol.
* \param[in] as Application Server in which to look for \ref asp
* \returns SS7 ASP in case a matching one is found; NULL otherwise */
struct osmo_ss7_asp
*osmo_ss7_asp_find_by_proto(struct osmo_ss7_as *as,
enum osmo_ss7_asp_protocol proto)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(as->cfg.asps); i++) {
if (as->cfg.asps[i] && as->cfg.asps[i]->cfg.proto == proto)
return as->cfg.asps[i];
}
return NULL;
}
struct osmo_ss7_asp *
osmo_ss7_asp_find(struct osmo_ss7_instance *inst, const char *name,
uint16_t remote_port, uint16_t local_port,
enum osmo_ss7_asp_protocol proto)
{
struct osmo_ss7_asp *asp;
OSMO_ASSERT(ss7_initialized);
asp = osmo_ss7_asp_find_by_name(inst, name);
if (!asp)
return NULL;
if ((asp->cfg.remote.port != remote_port || asp->cfg.local.port != local_port || asp->cfg.proto != proto))
return NULL;
return asp;
}
struct osmo_ss7_asp *
osmo_ss7_asp_find_or_create(struct osmo_ss7_instance *inst, const char *name,
uint16_t remote_port, uint16_t local_port,
enum osmo_ss7_asp_protocol proto)
{
struct osmo_ss7_asp *asp;
OSMO_ASSERT(ss7_initialized);
asp = osmo_ss7_asp_find_by_name(inst, name);
if (asp && (asp->cfg.remote.port != remote_port ||
asp->cfg.local.port != local_port ||
asp->cfg.proto != proto))
return NULL;
if (!asp) {
/* FIXME: check if local port has SCTP? */
asp = talloc_zero(inst, struct osmo_ss7_asp);
asp->ctrg = rate_ctr_group_alloc(asp, &ss7_asp_rcgd, g_ss7_asp_rcg_idx++);
if (!asp->ctrg) {
talloc_free(asp);
return NULL;
}
rate_ctr_group_set_name(asp->ctrg, name);
asp->inst = inst;
asp->cfg.remote.port = remote_port;
asp->cfg.local.port = local_port;
asp->cfg.proto = proto;
asp->cfg.name = talloc_strdup(asp, name);
llist_add_tail(&asp->list, &inst->asp_list);
/* The SUA code internally needs SCCP to work */
if (proto == OSMO_SS7_ASP_PROT_SUA)
osmo_ss7_ensure_sccp(inst);
}
return asp;
}
void osmo_ss7_asp_destroy(struct osmo_ss7_asp *asp)
{
struct osmo_ss7_as *as;
OSMO_ASSERT(ss7_initialized);
LOGPASP(asp, DLSS7, LOGL_INFO, "Destroying ASP\n");
if (asp->server)
osmo_stream_srv_destroy(asp->server);
if (asp->client)
osmo_stream_cli_destroy(asp->client);
if (asp->fi)
osmo_fsm_inst_term(asp->fi, OSMO_FSM_TERM_REQUEST, NULL);
if (asp->xua_server)
llist_del(&asp->siblings);
/* unlink from all ASs we are part of */
llist_for_each_entry(as, &asp->inst->as_list, list) {
unsigned int i;
for (i = 0; i < ARRAY_SIZE(as->cfg.asps); i++) {
if (as->cfg.asps[i] == asp) {
as->cfg.asps[i] = NULL;
}
}
}
/* unlink from ss7_instance */
asp->inst = NULL;
llist_del(&asp->list);
rate_ctr_group_free(asp->ctrg);
/* release memory */
talloc_free(asp);
}
static int xua_cli_read_cb(struct osmo_stream_cli *conn);
static int ipa_cli_read_cb(struct osmo_stream_cli *conn);
static int xua_cli_connect_cb(struct osmo_stream_cli *cli);
int osmo_ss7_asp_restart(struct osmo_ss7_asp *asp)
{
int rc;
char bufloc[512], bufrem[512];
OSMO_ASSERT(ss7_initialized);
osmo_ss7_asp_peer_snprintf(bufloc, sizeof(bufloc), &asp->cfg.local);
osmo_ss7_asp_peer_snprintf(bufrem, sizeof(bufrem), &asp->cfg.remote);
LOGPASP(asp, DLSS7, LOGL_INFO, "Restarting ASP %s, r=%s<->l=%s\n",
asp->cfg.name, bufrem, bufloc);
if (!asp->cfg.is_server) {
/* We are in client mode now */
if (asp->server) {
/* if we previously were in server mode,
* destroy it */
osmo_stream_srv_destroy(asp->server);
asp->server = NULL;
}
if (!asp->client)
asp->client = osmo_stream_cli_create(asp);
if (!asp->client) {
LOGPASP(asp, DLSS7, LOGL_ERROR, "Unable to create stream"
" client for ASP %s\n", asp->cfg.name);
return -1;
}
osmo_stream_cli_set_nodelay(asp->client, true);
osmo_stream_cli_set_addrs(asp->client, (const char**)asp->cfg.remote.host, asp->cfg.remote.host_cnt);
osmo_stream_cli_set_port(asp->client, asp->cfg.remote.port);
osmo_stream_cli_set_local_addrs(asp->client, (const char**)asp->cfg.local.host, asp->cfg.local.host_cnt);
osmo_stream_cli_set_local_port(asp->client, asp->cfg.local.port);
osmo_stream_cli_set_proto(asp->client, asp_proto_to_ip_proto(asp->cfg.proto));
osmo_stream_cli_set_reconnect_timeout(asp->client, 5);
osmo_stream_cli_set_connect_cb(asp->client, xua_cli_connect_cb);
if (asp->cfg.proto == OSMO_SS7_ASP_PROT_IPA)
osmo_stream_cli_set_read_cb(asp->client, ipa_cli_read_cb);
else
osmo_stream_cli_set_read_cb(asp->client, xua_cli_read_cb);
osmo_stream_cli_set_data(asp->client, asp);
rc = osmo_stream_cli_open(asp->client);
if (rc < 0) {
LOGPASP(asp, DLSS7, LOGL_ERROR, "Unable to open stream"
" client for ASP %s, %s ==> %s\n", asp->cfg.name, bufloc, bufrem);
/* we don't return error in here because osmo_stream_cli_open()
will continue to retry (due to timeout being explicitly set with
osmo_stream_cli_set_reconnect_timeout() above) to connect so the error is transient */
}
} else {
/* We are in server mode now */
if (asp->client) {
/* if we previously were in client mode,
* destroy it */
osmo_stream_cli_destroy(asp->client);
asp->client = NULL;
}
/* FIXME: ensure we have a SCTP server */
LOGPASP(asp, DLSS7, LOGL_NOTICE, "ASP Restart for server "
"not implemented yet!\n");
}
/* (re)start the ASP FSM */
if (asp->fi)
osmo_fsm_inst_term(asp->fi, OSMO_FSM_TERM_REQUEST, NULL);
asp->fi = xua_asp_fsm_start(asp, asp->cfg.role, LOGL_DEBUG);
return 0;
}
bool osmo_ss7_asp_active(const struct osmo_ss7_asp *asp)
{
if (!asp->fi)
return false;
return asp->fi->state == XUA_ASP_S_ACTIVE;
}
/***********************************************************************
* libosmo-netif integration for SCTP stream server/client
***********************************************************************/
static int get_logevel_by_sn_type(int sn_type)
{
switch (sn_type) {
case SCTP_ADAPTATION_INDICATION:
case SCTP_PEER_ADDR_CHANGE:
#ifdef SCTP_AUTHENTICATION_INDICATION
case SCTP_AUTHENTICATION_INDICATION:
#endif
#ifdef SCTP_SENDER_DRY_EVENT
case SCTP_SENDER_DRY_EVENT:
#endif
return LOGL_INFO;
case SCTP_ASSOC_CHANGE:
return LOGL_NOTICE;
case SCTP_SHUTDOWN_EVENT:
case SCTP_PARTIAL_DELIVERY_EVENT:
return LOGL_NOTICE;
case SCTP_SEND_FAILED:
case SCTP_REMOTE_ERROR:
return LOGL_ERROR;
default:
return LOGL_NOTICE;
}
}
static void log_sctp_notification(struct osmo_ss7_asp *asp, const char *pfx,
union sctp_notification *notif)
{
int log_level;
LOGPASP(asp, DLSS7, LOGL_INFO, "%s SCTP NOTIFICATION %u flags=0x%0x\n",
pfx, notif->sn_header.sn_type,
notif->sn_header.sn_flags);
log_level = get_logevel_by_sn_type(notif->sn_header.sn_type);
switch (notif->sn_header.sn_type) {
case SCTP_ASSOC_CHANGE:
LOGPASP(asp, DLSS7, log_level, "%s SCTP_ASSOC_CHANGE: %s\n",
pfx, osmo_sctp_assoc_chg_str(notif->sn_assoc_change.sac_state));
break;
default:
LOGPASP(asp, DLSS7, log_level, "%s %s\n",
pfx, osmo_sctp_sn_type_str(notif->sn_header.sn_type));
break;
}
}
/* netif code tells us we can read something from the socket */
static int ipa_srv_conn_cb(struct osmo_stream_srv *conn)
{
struct osmo_fd *ofd = osmo_stream_srv_get_ofd(conn);
struct osmo_ss7_asp *asp = osmo_stream_srv_get_data(conn);
struct msgb *msg = NULL;
int rc;
/* read IPA message from socket and process it */
rc = ipa_msg_recv_buffered(ofd->fd, &msg, &asp->pending_msg);
LOGPASP(asp, DLSS7, LOGL_DEBUG, "%s(): ipa_msg_recv_buffered() returned %d\n",
__func__, rc);
if (rc <= 0) {
if (rc == -EAGAIN) {
/* more data needed */
return 0;
}
osmo_stream_srv_destroy(conn);
return rc;
}
if (osmo_ipa_process_msg(msg) < 0) {
LOGPASP(asp, DLSS7, LOGL_ERROR, "Bad IPA message\n");
osmo_stream_srv_destroy(conn);
msgb_free(msg);
return -1;
}
msg->dst = asp;
return ipa_rx_msg(asp, msg);
}
/* netif code tells us we can read something from the socket */
static int xua_srv_conn_cb(struct osmo_stream_srv *conn)
{
struct osmo_fd *ofd = osmo_stream_srv_get_ofd(conn);
struct osmo_ss7_asp *asp = osmo_stream_srv_get_data(conn);
struct msgb *msg = m3ua_msgb_alloc("xUA Server Rx");
struct sctp_sndrcvinfo sinfo;
unsigned int ppid;
int flags = 0;
int rc;
if (!msg)
return -ENOMEM;
/* read xUA message from socket and process it */
rc = sctp_recvmsg(ofd->fd, msgb_data(msg), msgb_tailroom(msg),
NULL, NULL, &sinfo, &flags);
LOGPASP(asp, DLSS7, LOGL_DEBUG, "%s(): sctp_recvmsg() returned %d (flags=0x%x)\n",
__func__, rc, flags);
if (rc < 0) {
osmo_stream_srv_destroy(conn);
rc = -EBADF;
goto out;
} else if (rc == 0) {
osmo_stream_srv_destroy(conn);
rc = -EBADF;
goto out;
} else {
msgb_put(msg, rc);
}
if (flags & MSG_NOTIFICATION) {
union sctp_notification *notif = (union sctp_notification *) msgb_data(msg);
log_sctp_notification(asp, "xUA SRV", notif);
switch (notif->sn_header.sn_type) {
case SCTP_SHUTDOWN_EVENT:
osmo_stream_srv_destroy(conn);
rc = -EBADF;
break;
case SCTP_ASSOC_CHANGE:
if (notif->sn_assoc_change.sac_state == SCTP_RESTART)
xua_asp_send_xlm_prim_simple(asp, OSMO_XLM_PRIM_M_SCTP_RESTART,
PRIM_OP_INDICATION);
rc = 0;
break;
default:
rc = 0;
break;
}
goto out;
}
ppid = ntohl(sinfo.sinfo_ppid);
msgb_sctp_ppid(msg) = ppid;
msgb_sctp_stream(msg) = sinfo.sinfo_stream;
msg->dst = asp;
rate_ctr_inc2(asp->ctrg, SS7_ASP_CTR_PKT_RX_TOTAL);
if (ppid == SUA_PPID && asp->cfg.proto == OSMO_SS7_ASP_PROT_SUA)
rc = sua_rx_msg(asp, msg);
else if (ppid == M3UA_PPID && asp->cfg.proto == OSMO_SS7_ASP_PROT_M3UA)
rc = m3ua_rx_msg(asp, msg);
else
rc = ss7_asp_rx_unknown(asp, ppid, msg);
out:
msgb_free(msg);
return rc;
}
/* client has established SCTP connection to server */
static int xua_cli_connect_cb(struct osmo_stream_cli *cli)
{
struct osmo_fd *ofd = osmo_stream_cli_get_ofd(cli);
struct osmo_ss7_asp *asp = osmo_stream_cli_get_data(cli);
/* update the socket name */
talloc_free(asp->sock_name);
asp->sock_name = osmo_sock_get_name(asp, ofd->fd);
LOGPASP(asp, DLSS7, LOGL_INFO, "Client connected %s\n", asp->sock_name);
if (asp->lm && asp->lm->prim_cb) {
/* Notify layer manager that a connection has been
* established */
xua_asp_send_xlm_prim_simple(asp, OSMO_XLM_PRIM_M_SCTP_ESTABLISH, PRIM_OP_INDICATION);
} else {
/* directly as the ASP FSM to start by sending an ASP-UP ... */
osmo_fsm_inst_dispatch(asp->fi, XUA_ASP_E_M_ASP_UP_REQ, NULL);
}
return 0;
}
static void xua_cli_close(struct osmo_stream_cli *cli)
{
struct osmo_ss7_asp *asp = osmo_stream_cli_get_data(cli);
osmo_stream_cli_close(cli);
osmo_fsm_inst_dispatch(asp->fi, XUA_ASP_E_SCTP_COMM_DOWN_IND, asp);
/* send M-SCTP_RELEASE.ind to XUA Layer Manager */
xua_asp_send_xlm_prim_simple(asp, OSMO_XLM_PRIM_M_SCTP_RELEASE, PRIM_OP_INDICATION);
}
static void xua_cli_close_and_reconnect(struct osmo_stream_cli *cli)
{
xua_cli_close(cli);
osmo_stream_cli_reconnect(cli);
}
/* read call-back for IPA/SCCPlite socket */
static int ipa_cli_read_cb(struct osmo_stream_cli *conn)
{
struct osmo_fd *ofd = osmo_stream_cli_get_ofd(conn);
struct osmo_ss7_asp *asp = osmo_stream_cli_get_data(conn);
struct msgb *msg = NULL;
int rc;
/* read IPA message from socket and process it */
rc = ipa_msg_recv_buffered(ofd->fd, &msg, &asp->pending_msg);
LOGPASP(asp, DLSS7, LOGL_DEBUG, "%s(): ipa_msg_recv_buffered() returned %d\n",
__func__, rc);
if (rc <= 0) {
if (rc == -EAGAIN) {
/* more data needed */
return 0;
}
xua_cli_close_and_reconnect(conn);
return rc;
}
if (osmo_ipa_process_msg(msg) < 0) {
LOGPASP(asp, DLSS7, LOGL_ERROR, "Bad IPA message\n");
xua_cli_close_and_reconnect(conn);
msgb_free(msg);
return -1;
}
msg->dst = asp;
rate_ctr_inc2(asp->ctrg, SS7_ASP_CTR_PKT_RX_TOTAL);
return ipa_rx_msg(asp, msg);
}
static int xua_cli_read_cb(struct osmo_stream_cli *conn)
{
struct osmo_fd *ofd = osmo_stream_cli_get_ofd(conn);
struct osmo_ss7_asp *asp = osmo_stream_cli_get_data(conn);
struct msgb *msg = m3ua_msgb_alloc("xUA Client Rx");
struct sctp_sndrcvinfo sinfo;
unsigned int ppid;
int flags = 0;
int rc;
if (!msg)
return -ENOMEM;
/* read xUA message from socket and process it */
rc = sctp_recvmsg(ofd->fd, msgb_data(msg), msgb_tailroom(msg),
NULL, NULL, &sinfo, &flags);
LOGPASP(asp, DLSS7, LOGL_DEBUG, "%s(): sctp_recvmsg() returned %d (flags=0x%x)\n",
__func__, rc, flags);
if (rc < 0) {
xua_cli_close_and_reconnect(conn);
goto out;
} else if (rc == 0) {
xua_cli_close_and_reconnect(conn);
} else {
msgb_put(msg, rc);
}
if (flags & MSG_NOTIFICATION) {
union sctp_notification *notif = (union sctp_notification *) msgb_data(msg);
log_sctp_notification(asp, "xUA CLNT", notif);
switch (notif->sn_header.sn_type) {
case SCTP_SHUTDOWN_EVENT:
xua_cli_close_and_reconnect(conn);
break;
case SCTP_ASSOC_CHANGE:
if (notif->sn_assoc_change.sac_state == SCTP_RESTART)
xua_asp_send_xlm_prim_simple(asp, OSMO_XLM_PRIM_M_SCTP_RESTART,
PRIM_OP_INDICATION);
default:
break;
}
rc = 0;
goto out;
}
if (rc == 0)
goto out;
ppid = ntohl(sinfo.sinfo_ppid);
msgb_sctp_ppid(msg) = ppid;
msgb_sctp_stream(msg) = sinfo.sinfo_stream;
msg->dst = asp;
rate_ctr_inc2(asp->ctrg, SS7_ASP_CTR_PKT_RX_TOTAL);
if (ppid == SUA_PPID && asp->cfg.proto == OSMO_SS7_ASP_PROT_SUA)
rc = sua_rx_msg(asp, msg);
else if (ppid == M3UA_PPID && asp->cfg.proto == OSMO_SS7_ASP_PROT_M3UA)
rc = m3ua_rx_msg(asp, msg);
else
rc = ss7_asp_rx_unknown(asp, ppid, msg);
out:
msgb_free(msg);
return rc;
}
static int xua_srv_conn_closed_cb(struct osmo_stream_srv *srv)
{
struct osmo_ss7_asp *asp = osmo_stream_srv_get_data(srv);
LOGP(DLSS7, LOGL_INFO, "%s: connection closed\n", asp ? asp->cfg.name : "?");
if (!asp)
return 0;
/* notify ASP FSM and everyone else */
osmo_fsm_inst_dispatch(asp->fi, XUA_ASP_E_SCTP_COMM_DOWN_IND, NULL);
/* delete any RKM-dynamically allocated ASs for this ASP */
xua_rkm_cleanup_dyn_as_for_asp(asp);
/* send M-SCTP_RELEASE.ind to Layer Manager */
xua_asp_send_xlm_prim_simple(asp, OSMO_XLM_PRIM_M_SCTP_RELEASE, PRIM_OP_INDICATION);
asp->server = NULL;
/* if we were dynamically allocated at accept_cb() time, let's
* self-destruct now. A new connection will re-create the ASP. */
if (asp->dyn_allocated) {
/* avoid re-entrance via osmo_stream_srv_destroy() which
* called us */
osmo_ss7_asp_destroy(asp);
}
return 0;
}
/* server has accept()ed a new SCTP association, let's find the ASP for
* it (if any) */
static int xua_accept_cb(struct osmo_stream_srv_link *link, int fd)
{
struct osmo_xua_server *oxs = osmo_stream_srv_link_get_data(link);
struct osmo_stream_srv *srv;
struct osmo_ss7_asp *asp;
char *sock_name = osmo_sock_get_name(link, fd);
const char *proto_name = get_value_string(osmo_ss7_asp_protocol_vals, oxs->cfg.proto);
LOGP(DLSS7, LOGL_INFO, "%s: New %s connection accepted\n", sock_name, proto_name);
if (oxs->cfg.proto == OSMO_SS7_ASP_PROT_IPA) {
srv = osmo_stream_srv_create(oxs, link, fd,
ipa_srv_conn_cb,
xua_srv_conn_closed_cb, NULL);
} else {
srv = osmo_stream_srv_create(oxs, link, fd,
xua_srv_conn_cb,
xua_srv_conn_closed_cb, NULL);
}
if (!srv) {
LOGP(DLSS7, LOGL_ERROR, "%s: Unable to create stream server "
"for connection\n", sock_name);
close(fd);
talloc_free(sock_name);
return -1;
}
asp = osmo_ss7_asp_find_by_socket_addr(fd);
if (asp) {
LOGP(DLSS7, LOGL_INFO, "%s: matched connection to ASP %s\n",
sock_name, asp->cfg.name);
/* we need to check if we already have a socket associated, and close it. Otherwise it might
* happen that both the listen-fd for this accept() and the old socket are marked 'readable'
* during the same scheduling interval, and we're processing them in the "wrong" order, i.e.
* we first see the accept of the new fd before we see the close on the old fd */
if (asp->server) {
LOGPASP(asp, DLSS7, LOGL_FATAL, "accept of new connection from %s before old was closed "
"-> close old one\n", sock_name);
osmo_stream_srv_set_data(asp->server, NULL);
osmo_stream_srv_destroy(asp->server);
asp->server = NULL;
}
} else {
if (!oxs->cfg.accept_dyn_reg) {
LOGP(DLSS7, LOGL_NOTICE, "%s: %s connection without matching "
"ASP definition and no dynamic registration enabled, terminating\n",
sock_name, proto_name);
} else {
char namebuf[32];
static uint32_t dyn_asp_num = 0;
snprintf(namebuf, sizeof(namebuf), "asp-dyn-%u", dyn_asp_num++);
asp = osmo_ss7_asp_find_or_create(oxs->inst, namebuf, 0, 0,
oxs->cfg.proto);
if (asp) {
char hostbuf[INET6_ADDRSTRLEN];
const char *hostbuf_ptr = &hostbuf[0];
char portbuf[16];
osmo_sock_get_ip_and_port(fd, hostbuf, sizeof(hostbuf), portbuf, sizeof(portbuf), false);
LOGP(DLSS7, LOGL_INFO, "%s: created dynamic ASP %s\n",
sock_name, asp->cfg.name);
asp->cfg.is_server = true;
asp->cfg.role = OSMO_SS7_ASP_ROLE_SG;
asp->cfg.local.port = oxs->cfg.local.port;
asp->cfg.remote.port = atoi(portbuf);
asp->dyn_allocated = true;
asp->server = srv;
osmo_ss7_asp_peer_set_hosts(&asp->cfg.local, asp,
(const char* const*)oxs->cfg.local.host,
oxs->cfg.local.host_cnt);
osmo_ss7_asp_peer_set_hosts(&asp->cfg.remote, asp,
&hostbuf_ptr, 1);
osmo_ss7_asp_restart(asp);
}
}
if (!asp) {
osmo_stream_srv_destroy(srv);
talloc_free(sock_name);
return -1;
}
llist_add_tail(&asp->siblings, &oxs->asp_list);
}
/* update the ASP reference back to the server over which the
* connection came in */
asp->server = srv;
asp->xua_server = oxs;
/* update the ASP socket name */
talloc_free(asp->sock_name);
asp->sock_name = talloc_reparent(link, asp, sock_name);
/* make sure the conn_cb() is called with the asp as private
* data */
osmo_stream_srv_set_data(srv, asp);
/* send M-SCTP_ESTABLISH.ind to Layer Manager */
osmo_fsm_inst_dispatch(asp->fi, XUA_ASP_E_SCTP_EST_IND, 0);
xua_asp_send_xlm_prim_simple(asp, OSMO_XLM_PRIM_M_SCTP_ESTABLISH, PRIM_OP_INDICATION);
return 0;
}
/*! \brief send a fully encoded msgb via a given ASP
* \param[in] asp Application Server Process through which to send
* \param[in] msg message buffer to transmit. Ownership transferred.
* \returns 0 on success; negative in case of error */
int osmo_ss7_asp_send(struct osmo_ss7_asp *asp, struct msgb *msg)
{
OSMO_ASSERT(ss7_initialized);
switch (asp->cfg.proto) {
case OSMO_SS7_ASP_PROT_SUA:
msgb_sctp_ppid(msg) = SUA_PPID;
break;
case OSMO_SS7_ASP_PROT_M3UA:
msgb_sctp_ppid(msg) = M3UA_PPID;
break;
case OSMO_SS7_ASP_PROT_IPA:
break;
default:
OSMO_ASSERT(0);
}
rate_ctr_inc2(asp->ctrg, SS7_ASP_CTR_PKT_TX_TOTAL);
if (asp->cfg.is_server) {
if (!asp->server) {
LOGPASP(asp, DLSS7, LOGL_ERROR, "Cannot transmit, no asp->server\n");
/* FIXME: what to do here? delete the route? send DUNA? */
msgb_free(msg);
return -EIO;
}
osmo_stream_srv_send(asp->server, msg);
} else {
if (!asp->client) {
LOGPASP(asp, DLSS7, LOGL_ERROR, "Cannot transmit, no asp->client\n");
/* FIXME: what to do here? delete the route? send DUNA? */
msgb_free(msg);
return -EIO;
}
if (!osmo_stream_cli_is_connected(asp->client)) {
LOGPASP(asp, DLSS7, LOGL_ERROR, "Cannot transmit, asp->client not connected\n");
msgb_free(msg);
return -EIO;
}
osmo_stream_cli_send(asp->client, msg);
}
return 0;
}
void osmo_ss7_asp_disconnect(struct osmo_ss7_asp *asp)
{
if (asp->server)
osmo_stream_srv_destroy(asp->server);
/* the close_cb() will handle the remaining cleanup here */
else if (asp->client)
xua_cli_close_and_reconnect(asp->client);
}
/***********************************************************************
* SS7 xUA Server
***********************************************************************/
struct osmo_xua_server *
osmo_ss7_xua_server_find(struct osmo_ss7_instance *inst, enum osmo_ss7_asp_protocol proto,
uint16_t local_port)
{
struct osmo_xua_server *xs;
OSMO_ASSERT(ss7_initialized);
llist_for_each_entry(xs, &inst->xua_servers, list) {
if (proto == xs->cfg.proto &&
local_port == xs->cfg.local.port)
return xs;
}
return NULL;
}
/*! \brief create a new xUA server configured with given ip/port
* \param[in] ctx talloc allocation context
* \param[in] proto protocol (xUA variant) to use
* \param[in] local_port local SCTP port to bind/listen to
* \param[in] local_host local IP address to bind/listen to (optional)
* \returns callee-allocated \ref osmo_xua_server in case of success
*/
struct osmo_xua_server *
osmo_ss7_xua_server_create(struct osmo_ss7_instance *inst, enum osmo_ss7_asp_protocol proto,
uint16_t local_port, const char *local_host)
{
struct osmo_xua_server *oxs = talloc_zero(inst, struct osmo_xua_server);
OSMO_ASSERT(ss7_initialized);
if (!oxs)
return NULL;
LOGP(DLSS7, LOGL_INFO, "Creating %s Server %s:%u\n",
get_value_string(osmo_ss7_asp_protocol_vals, proto), local_host, local_port);
INIT_LLIST_HEAD(&oxs->asp_list);
oxs->cfg.proto = proto;
oxs->cfg.local.port = local_port;
oxs->server = osmo_stream_srv_link_create(oxs);
osmo_stream_srv_link_set_data(oxs->server, oxs);
osmo_stream_srv_link_set_accept_cb(oxs->server, xua_accept_cb);
osmo_stream_srv_link_set_nodelay(oxs->server, true);
osmo_stream_srv_link_set_port(oxs->server, oxs->cfg.local.port);
osmo_stream_srv_link_set_proto(oxs->server, asp_proto_to_ip_proto(proto));
osmo_ss7_xua_server_set_local_host(oxs, local_host);
LOGP(DLSS7, LOGL_INFO, "Created %s server on %s:%" PRIu16 "\n",
get_value_string(osmo_ss7_asp_protocol_vals, proto), local_host, local_port);
oxs->inst = inst;
llist_add_tail(&oxs->list, &inst->xua_servers);
/* The SUA code internally needs SCCP to work */
if (proto == OSMO_SS7_ASP_PROT_SUA)
osmo_ss7_ensure_sccp(inst);
return oxs;
}
/*! \brief Set the xUA server to bind/listen to the currently configured ip/port
* \param[in] xs xUA server to operate
* \returns 0 on success, negative value on error.
*/
int
osmo_ss7_xua_server_bind(struct osmo_xua_server *xs)
{
char buf[512];
int rc;
const char *proto = get_value_string(osmo_ss7_asp_protocol_vals, xs->cfg.proto);
rc = osmo_ss7_asp_peer_snprintf(buf, sizeof(buf), &xs->cfg.local);
if (rc < 0) {
LOGP(DLSS7, LOGL_INFO, "Failed parsing %s Server osmo_ss7_asp_peer\n", proto);
} else {
LOGP(DLSS7, LOGL_INFO, "(Re)binding %s Server to %s\n",
proto, buf);
}
return osmo_stream_srv_link_open(xs->server);
}
int
osmo_ss7_xua_server_set_local_host(struct osmo_xua_server *xs, const char *local_host)
{
return osmo_ss7_xua_server_set_local_hosts(xs, &local_host, 1);
}
int
osmo_ss7_xua_server_set_local_hosts(struct osmo_xua_server *xs, const char **local_hosts, size_t local_host_cnt)
{
int rc;
OSMO_ASSERT(ss7_initialized);
rc = osmo_ss7_asp_peer_set_hosts(&xs->cfg.local, xs, local_hosts, local_host_cnt);
if (rc < 0)
return rc;
return osmo_stream_srv_link_set_addrs(xs->server, (const char **)xs->cfg.local.host, xs->cfg.local.host_cnt);
}
int
osmo_ss7_xua_server_add_local_host(struct osmo_xua_server *xs, const char *local_host)
{
int rc;
rc = osmo_ss7_asp_peer_add_host(&xs->cfg.local, xs, local_host);
if (rc < 0)
return rc;
return osmo_stream_srv_link_set_addrs(xs->server, (const char **)xs->cfg.local.host, xs->cfg.local.host_cnt);
}
bool osmo_ss7_xua_server_set_default_local_hosts(struct osmo_xua_server *oxs)
{
/* If no local addr was set, or erased after _create(): */
if (!oxs->cfg.local.host_cnt) {
/* "::" Covers both IPv4 and IPv6 */
if (ipv6_sctp_supported("::", true))
osmo_ss7_xua_server_set_local_host(oxs, "::");
else
osmo_ss7_xua_server_set_local_host(oxs, "0.0.0.0");
return true;
}
return false;
}
void osmo_ss7_xua_server_destroy(struct osmo_xua_server *xs)
{
struct osmo_ss7_asp *asp, *asp2;
if (xs->server) {
osmo_stream_srv_link_close(xs->server);
osmo_stream_srv_link_destroy(xs->server);
}
/* iterate and close all connections established in relation
* with this server */
llist_for_each_entry_safe(asp, asp2, &xs->asp_list, siblings)
osmo_ss7_asp_destroy(asp);
llist_del(&xs->list);
talloc_free(xs);
}
bool osmo_ss7_pc_is_local(struct osmo_ss7_instance *inst, uint32_t pc)
{
OSMO_ASSERT(ss7_initialized);
if (osmo_ss7_pc_is_valid(inst->cfg.primary_pc) && pc == inst->cfg.primary_pc)
return true;
/* FIXME: Secondary and Capability Point Codes */
return false;
}
int osmo_ss7_init(void)
{
int rc;
if (ss7_initialized)
return 1;
rc = osmo_fsm_register(&sccp_scoc_fsm);
if (rc < 0)
return rc;
rc = osmo_fsm_register(&xua_as_fsm);
if (rc < 0)
return rc;
rc = osmo_fsm_register(&xua_asp_fsm);
if (rc < 0)
return rc;
rc = osmo_fsm_register(&ipa_asp_fsm);
if (rc < 0)
return rc;
rc = osmo_fsm_register(&xua_default_lm_fsm);
if (rc < 0)
return rc;
ss7_initialized = true;
return 0;
}
int osmo_ss7_tmode_to_xua(enum osmo_ss7_as_traffic_mode tmod)
{
switch (tmod) {
case OSMO_SS7_AS_TMOD_OVERRIDE:
return M3UA_TMOD_OVERRIDE;
case OSMO_SS7_AS_TMOD_LOADSHARE:
return M3UA_TMOD_LOADSHARE;
case OSMO_SS7_AS_TMOD_BCAST:
return M3UA_TMOD_BCAST;
default:
return -1;
}
}
enum osmo_ss7_as_traffic_mode osmo_ss7_tmode_from_xua(uint32_t in)
{
switch (in) {
case M3UA_TMOD_OVERRIDE:
return OSMO_SS7_AS_TMOD_OVERRIDE;
case M3UA_TMOD_LOADSHARE:
return OSMO_SS7_AS_TMOD_LOADSHARE;
case M3UA_TMOD_BCAST:
return OSMO_SS7_AS_TMOD_BCAST;
default:
OSMO_ASSERT(false);
}
}
bool osmo_ss7_as_tmode_compatible_xua(struct osmo_ss7_as *as, uint32_t m3ua_tmt)
{
if (!as->cfg.mode_set_by_vty && !as->cfg.mode_set_by_peer)
return true;
switch (m3ua_tmt) {
case M3UA_TMOD_OVERRIDE:
if (as->cfg.mode == OSMO_SS7_AS_TMOD_OVERRIDE)
return true;
break;
case M3UA_TMOD_LOADSHARE:
if (as->cfg.mode == OSMO_SS7_AS_TMOD_LOADSHARE ||
as->cfg.mode == OSMO_SS7_AS_TMOD_ROUNDROBIN)
return true;
break;
case M3UA_TMOD_BCAST:
if (as->cfg.mode == OSMO_SS7_AS_TMOD_BCAST)
return true;
break;
default:
break;
}
return false;
}
static osmo_ss7_asp_rx_unknown_cb *g_osmo_ss7_asp_rx_unknown_cb;
int ss7_asp_rx_unknown(struct osmo_ss7_asp *asp, int ppid_mux, struct msgb *msg)
{
rate_ctr_inc2(asp->ctrg, SS7_ASP_CTR_PKT_RX_UNKNOWN);
if (g_osmo_ss7_asp_rx_unknown_cb)
return (*g_osmo_ss7_asp_rx_unknown_cb)(asp, ppid_mux, msg);
switch(asp->cfg.proto) {
case OSMO_SS7_ASP_PROT_IPA:
LOGPASP(asp, DLSS7, LOGL_NOTICE, "Rx IPA for unknown Stream ID 0x%02x: %s\n",
ppid_mux, msgb_hexdump(msg));
break;
default:
LOGPASP(asp, DLSS7, LOGL_NOTICE, "Rx SCTP chunk for unknown PPID %u: %s\n",
ppid_mux, msgb_hexdump(msg));
break;
}
return 0;
}
/*! Get the logging subsystem for a given ASP. Used by generic code. */
int osmo_ss7_asp_get_log_subsys(const struct osmo_ss7_asp *asp)
{
switch (asp->cfg.proto) {
case OSMO_SS7_ASP_PROT_M3UA:
return DLM3UA;
case OSMO_SS7_ASP_PROT_SUA:
return DLSUA;
default:
return DLSS7;
}
}
/*! Register a call-back function for unknown SCTP PPID / IPA Stream ID */
void osmo_ss7_register_rx_unknown_cb(osmo_ss7_asp_rx_unknown_cb *cb)
{
g_osmo_ss7_asp_rx_unknown_cb = cb;
}
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